TM 1-1520-238-23
3-139
3.39.
TAIL LANDING GEAR SHOCK STRUT PISTON REMOVAL/INSTALLATION (AVIM) – continued
j. With strut (7) vertical and valve (1) down, ap-
ply 500 psi hydraulic pressure to fill port (14)
for a minimum of 15 SECONDS and then re-
lease.
(1) Repeat procedure 10 times. Do not release
pressure on last cycle.
k. Release nitrogen pressure to zero with strut
(7) vertical.
l. Bleed hydraulic pressure from reducer (23).
(1) Remove servicing hose (24) from supply.
m. Remove reducer (23) from fill port (14). Use
adjustable wrench.
n. Install plug (12) lightly (do not tighten) to al-
low air but not fluid to escape.
(1) Slowly move strut (7) to horizontal with fill port
(14) up.
o. Slowly rock strut (7) back and forth end to end
three or four times while gently tapping on
cylinder barrel to allow all trapped air to es-
cape through fill port (14).
(1) Allow strut (7) to remain horizontal at least 5
MINUTES.
p. Manually compress piston (2) fully.
q. Check that strut (7) is full. Repeat steps b. thru
n. if strut is not full.
r. Install plug (12) in strut (7).
(1) Lubricate new packing (13). Use hydraulic
fluid (item 93, App F).
(2) Install packing (13) on plug (12).
(3) Install plug (12) into port (14).
(4) Lockwire plug (12) to strut (7). Use wire
(item 226, App F).
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